package com.zhaoye.gulimall.product.service.impl;

import com.zhaoye.gulimall.product.service.CategoryBrandRelationService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zhaoye.common.utils.PageUtils;
import com.zhaoye.common.utils.Query;

import com.zhaoye.gulimall.product.dao.CategoryDao;
import com.zhaoye.gulimall.product.entity.CategoryEntity;
import com.zhaoye.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Autowired
    CategoryBrandRelationService categoryBrandRelationService;
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        // 1.查出所有的分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
        // 2.组装成树形结构
        // 2.一级分类
        List<CategoryEntity> levelMenus = entities.stream().filter(CategoryEntity ->
                CategoryEntity.getParentCid() == 0)
                .map((menu) -> {
                    menu.setChildren(getChildrens(menu, entities));
                    return menu;
                }).sorted((menu1, menu2) -> {
                    return (menu1.getSort() == null ? 0 : (menu1.getSort())) - (menu2.getSort() == null ? 0 : menu2.getSort());
                }).collect(Collectors.toList());
        return levelMenus;
    }

    @Override
    public void removeMenuByIds(List<Long> asList) {
        //TODO  1.检查当前菜单，是否被别的地方引用
        baseMapper.deleteBatchIds(asList);
    }

    @Override
    public Long[] findCatelogPath(Long catelogId) {
        List<Long> paths = new ArrayList<>();
        List<Long> parentPath = findParentPath(catelogId, paths);
        Collections.reverse(parentPath);
        return parentPath.toArray(new Long[parentPath.size()]);
    }

    /**
     * 级联更新所有关联的数据
     *
     * @param category
     */
    @Override
    public void updateCascade(CategoryEntity category) {
             this.updateById(category);
      categoryBrandRelationService.updateCategory(category.getCatId(),category.getName());
    }

    /**
     * 递归查找节点信息
     */
    private List<Long> findParentPath(Long catelogId, List<Long> paths) {
        // 1.收集当前节点id
        paths.add(catelogId);
        CategoryEntity byId = this.getById(catelogId);
        if (byId.getParentCid() != 0) {
            findParentPath(byId.getParentCid(), paths);
        }
        return paths;
    }

    /**
     * 找出子菜单
     *
     * @param root 当前菜单
     * @param all
     * @return
     */
    private List<CategoryEntity> getChildrens(CategoryEntity root, List<CategoryEntity> all) {
        List<CategoryEntity> children = all.stream()
                .filter(categoryEntity -> categoryEntity.getParentCid() == root.getCatId())
                //递归找出子菜单
                .map(categoryEntity -> {
                    categoryEntity.setChildren(getChildrens(categoryEntity, all));
                    return categoryEntity;
                }).sorted((menu1, menu2) -> {
                    return (menu1.getSort() == null ? 0 : (menu1.getSort())) - (menu2.getSort() == null ? 0 : menu2.getSort());
                })
                .collect(Collectors.toList());

        return children;
    }

}